2nd time we stayed at this hotel. Though not really at the airport area but close to it, a call to the hotel when you arrive will get them to send a driver to fetch you to the hotel.
The better pricing more than offset the extra time needed to get to the hotel.
It's only a 5 min walk to the S-bahn station that will connect you to the rail network. We did that. There's an inclined walkway to the S-bahn station so it is very easy to drag your luggage along.
It is possible to walk to a selection of big supermarkets at Langen. For example, we bought a few packs of our favourite rosti at Edeka Supermarket.
We could simply fry them up for dinner using the non-stick pan provided by the kitchenette in the room.
The Hungarian restaurant at the hotel was closed on Good Friday when we were there so we really appreciated the kitchenette that was in the room.
So on the whole, a great stay to get over our jetlag!